Nickel Phosphide: The Effect of Phosphorus Content on the Activity and Stability toward Oxygen Evolution Reaction in Alkaline Medium.

Autor: Poureshghi F; Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, N-7491, Norway.; Current address: Nel Hydrogen Electrolyzers AS, N-3674, Notodden, Norway., Seland F; Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, N-7491, Norway., Jensen JO; Department of Energy Conversion and Storage, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark., Sunde S; Department of Materials Science and Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, N-7491, Norway.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2024 Aug 28, pp. e202401586. Date of Electronic Publication: 2024 Aug 28.
DOI: 10.1002/cssc.202401586
Abstrakt: In this work a systematic study of the effect of the metal to phosphorus ratio in Ni-P nanoparticles on their catalytic activity with respect to the OER is reported. To this end, nickel phosphide nanoparticles are synthesized through two different synthesis routes, one involving in-situ phosphidation and one involving ex-situ phosphidation. In-situ phosphidation is performed via two steps route in a one-pot synthesis, in which Ni nanoparticles are formed at 220 °C, but not isolated, and then transformed to phase-pure either Ni 12 P 5 or Ni 2 P nanocrystallites. In the second synthesis method (ex-situ phosphidation), nickel nanoparticles with an excess amount of trioctylphosphine (TOP) as a capping agent are synthesized and separated from the solution, then subsequently annealed in three different atmospheres, leading to the formation of three types of Ni x P y viz. [Ni x P y -H 2 /Ar], [Ni x P y -Ar], and [Ni x P y -air]. [Ni x P y -air] nanoparticles shows the best electrocatalytic activity among the annealed nanoparticles in Ar and H 2 /Ar but lower than Ni 12 P 5 nanoparticles. However, [Ni x P y -air] shows very high stability in comparison with other synthesized nanoparticles. Moreover, the effect of the adventitious and spiked Fe in the electrolyte is studied on the electrocatalytic activity of all synthesized nanoparticles.
(© 2024 The Authors. ChemSusChem published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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